Evans: Notes on genus Herberta 207 



material, the statement is supported by Scottish specimens in the 

 Taylor herbarium, received from Hooker, and by the fact that 

 Dickson's plant was collected "in alpibus Scoticis." The type of 

 Dumortier's Schisma stramineum was likewise collected "in 

 alpibus Scotiae" and, in the complete absence of all of Dumortier's 

 types, his species may be regarded as a simple synonym of H. 

 adunca. The second form, jS Hutchinsiae, is described below as a 

 new species under the name H. Hutchinsiae (Gottsche). In cer- 

 tain respects the true H. adunca, as thus restricted, resembles 

 H. Sendtneri more strongly than it does H. Hutchinsiae. This 

 would account for the fact that Dumortier failed to distinguish 

 between his Schisma stramineum and H. Sendtneri. The latter 

 species, however, is clearly distinct, and there is no evidence that 

 its range extends beyond the mountains of Austria and Germany. 

 With regard to the North American specimens which have been 

 referred to H. adunca, there has likewise been confusion. There 

 are apparently two species represented, but neither agrees with 

 typical H. adunca. The plant from the eastern United States 

 seems to be new and is described below under the name H. tenuis; 

 the plant from the Pacific Coast, on the contrary, seems to be 

 referable to H. Hutchinsiae. The Alaskan material of this species 

 is unusually satisfactory because it shows androecia, perianths, 

 and sporophytes, all of which are exceedingly rare in European 

 material. The four species considered in the present paper may 

 be distinguished as follows, only vegetative characters being used : 



Leaves mostly 1.2-2 mm. long and 0.45-0.9 mm. wide. 



Leaves bifid about one half; divisions broad, slightly or not at 

 all curved, acute to acuminate; vitta not distinct, the 

 cells in the divisions mostly 20-40,^ long. 

 Basal portion of leaves normally entire. i. H. adunca. 



Basal portion of leaves sparingly and coarsely toothed. 2. H. Sendtneri. 

 Leaves bifid two thirds to four fifths; divisions narrow, strongly 

 curved, long-acuminate; vitta distinct, the cells in the 

 divisions often 50-70/^ long; basal portion of leaves entire or 

 nearly so. 3- H. Hutchinsiae. 



Leaves mostly 0.9-1 mm. long and 0.3-0.35 mm. wide, bifid two 

 thirds to three fourths; divisions narrow, slightly or not at all 

 curved, long-acuminate; vitta distinct, the cells in the divisions 

 often so-70;ulong; basal portion entire or sparingly and coarsely 

 toothed. 4- H. tenuis. 



